#include <iostream>
#include <string>
using namespace std;
class User
{
private:
    string account;
    string password;
    string email;
public:

       User(string account,string password,string email="void"):account(account),password(password),email(email){}
       void outInformation()
       {
           cout<<"Account:"<<account<<" Password:"<<password<<" E-mail:"<<email<<endl;
       }

};

int main()
{
    User u1("456","123","1");
    User u2("123","456");
    u1.outInformation();
    u2.outInformation();
    return 0;
}
